I would say rage is the expression of unlimited anger alone, while righteous anger is anger tempered by its claimed reason. At times they can be equal. Mostly, they're not, because mostly, rage is the loss of control over anger.
Why?
Because I’m curious why you would characterize Barnhardt’s writings as being full of rage rather than righteous anger. Do you disagree that she is correct to be angry about the things she describes in her writings? They are pretty much the same sorts of things that Freepers, and any sane American, are angry about.